Bad ignition (5)

I believe the answer is:

arson

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'bad ignition' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

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(Other definitions for arson that I've seen before include "serious offence" , "Criminal burning of property" , "matchplay, say?" , "Crime of fire-setting (5)" , "Sonar (anag.)" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

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